Thanks, very useful.

Emerson500:
Here are the links to some of the materials I used which has been shared here already before.

https://drive.google.com/open?id=0B1A32Ko0KVjhZDZEWFBsOWYybDA
https://drive.google.com/open?id=0B-ojk5EVi9onWm5NcHB5UEVYY2c

The first link contains cambridge IELTS 1 - 10. while the second has cambridge IELTS 5 - 12. So you might want to consider downloading the folders individually so you don't have duplicate copies and waste data. You can also request for a practise material from https://admissiontestportal.com/en/pages/4-ielts-test-preparation/

Other sites I used for tips were ieltsliz.com, readingielts.com ieltsbuddy.com especially for writing, band 9 speaking videos on youtube. E2 videos and so. Just practice reading and listening more with the cambridge ielts after looking up tips and you should be good to go for those ones.

I think for the duration for preparation, it depends on the time you put in and how fast you start getting desirable results and build your confidence. I took about 5 weeks to prepare.